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Due to the limited capacity of the Sturmoboot 39, the Deutche Pionieren designed a heavy assault boat for coastal operations (Operation Sea Lion , Unternehmen Seelöwe). By the 1941 the first prototype was tested at the Lake Konstanz.

The Stubo42 was 14.5m length, 3 meters wide and had a draft of 0.65 m. It was powered by two Vomag diesel engines with 250 hp each. The boat had a weight of 9.5 t and carried 3 crewman and up to 40 men with life jackets.

By mid 1942 there were about 50 Sturmboot42, most of them used by the Küstenjägers and Langungspioniers in the operations in the Mediterranean and Aegean see, Malta, Corsica and Sardinia, and North of Africa campaigns.

New version of the German Sturmboot 42 with AA MG 151/20 was the Führungsboot 42 (Fühbo 42) with cabin construction, used (from 1944 onwards) by the KüstenJägers